Birdsall, S. S., & Stephen S. Birdsall. (1998). An: Regional landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs.
Stile di citazione ChicagoBirdsall, Stephen S., e Stephen S. Birdsall. An: Regional Landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs, 1998.
Citazione MLABirdsall, Stephen S., e Stephen S. Birdsall. An: Regional Landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.